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Malte UblandClaude Opus 5.5
77faf0c9e6
The forms the first slice answers now lower: x.toLocaleString() (and an
explicit undefined locale) to icu.numFormatDefault, the argument-free
Date#toLocaleString/toLocaleTimeString to the ICU date formatters, and
Intl.Segmenter({ granularity: "word" }) to the ICU word iterator (a
literal language tag is the locale; the empty string is the default).
Sentence segmentation keeps its refusing construction in JavaScript
dependencies, the grapheme segmenter stays the engine-free fast path,
and the code notes the deletion I4 schedules.
The refusals that named these forms follow: the four stdlib hints, the
Intl identifier hint, the Date method hint and the Segmenter option
messages list what lowers and what still does not (locale negotiation,
options bags, toLocaleDateString, formatter values). The library mode
refuses the icu.* libCalls, whose ambient locale state and data file a
library archive cannot carry, and the ambient process.config comment says
what a compiled binary can honestly answer.
An argument that IS undefined (exactly undefined, or void) means the
absent form and lowers; one whose type merely includes undefined may hold
a locale or an options bag at run time, and the constructor cannot read
either, so it is refused rather than silently treated as absent.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
25 lines
1.3 KiB
TypeScript
25 lines
1.3 KiB
TypeScript
// The Intl surface. What lowers: the COMPOSED en-US NumberFormat forms
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// with default options — new Intl.NumberFormat("en-US").format(x) and
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// x.toLocaleString("en-US") — plus the default locale's own forms over ICU
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// (x.toLocaleString(), d.toLocaleString()). Everything else fences by
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// NAME: other locales (ICU locale negotiation), options bags, formatter
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// VALUES, and the rest of the Intl namespace (DurationFormat,
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// DateTimeFormat, PluralRules, getCanonicalLocales).
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// The unlowered NumberFormat variants, each with its own reason.
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const noLocale = new Intl.NumberFormat().format(1234.5);
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const otherLocale = new Intl.NumberFormat("de-DE").format(1234.5);
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const withOptions = new Intl.NumberFormat("en-US", { maximumFractionDigits: 2 }).format(1234.5);
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const hoisted = new Intl.NumberFormat("en-US");
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const viaValue = hoisted.format(1234.5);
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// toLocaleString's unlowered variants.
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const german = (1234.5).toLocaleString("de-DE");
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const grouped = (1234.5).toLocaleString("en-US", { useGrouping: false });
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// The rest of Intl keeps the ICU story.
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const when = new Intl.DateTimeFormat("en-US").format();
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const dur = new Intl.DurationFormat("en-US").format({ hours: 1, minutes: 23 });
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const rule = new Intl.PluralRules("en-US").select(1);
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const canon = Intl.getCanonicalLocales("en-us");
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